I'm not sure how the tram or bus drivers are trained, but those of us here at EAA HQ are told that the convention is primarily a pedestrian event. We are NEVER to use our horn or force our way through. The people on foot come first. And yes, it does get frustrating sometimes when it seems some people are purposely walking in the middle of the road to make someone wait for them. But hey, that's the way it is! No horns is the rule I was always taught. I think that's pretty universal around the grounds.